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Concatenate all previous terms in base 2 and add 1.
0

%I #2 Mar 30 2012 19:00:32

%S 1,2,7,56,3577,14650874,245800875560443,69186795723834511322549030396,

%T 5481542695449169597391342941171449411715229000017383493117,

%U 34408201166200166200569227185360653842738060575673892157335543426983809094492843999968169181712034077264531412717054

%N Concatenate all previous terms in base 2 and add 1.

%K easy,nonn,base

%O 1,2

%A _Vladimir Reshetnikov_, Sep 11 2010